Prep the oven and pan: Preheat your oven to 400°F (200°C).
Lightly grease a 9x13-inch baking dish or line it with parchment for easy cleanup.
Trim and pat dry: Trim excess fat from the chicken and pat it dry with paper towels. Dry chicken helps the sauce cling and prevents steaming.
Make the yogurt sauce: In a bowl, whisk together Greek yogurt, olive oil, garlic, Dijon, lemon zest, lemon juice, salt, pepper, paprika, oregano, onion powder, red pepper flakes, and Parmesan (if using). Taste and adjust salt or lemon.
Season the chicken: Lightly sprinkle the chicken with a pinch of salt and pepper on both sides.
This layers the flavor.
Coat generously: Add the chicken to the baking dish and spoon the yogurt mixture over each piece, spreading to fully cover. A thick layer keeps the chicken moist.
Bake: Bake uncovered for 22–28 minutes for breasts (thighs may need 28–32 minutes), until the thickest part reaches 165°F (74°C). The sauce will be creamy with light golden spots.
Optional broil: For more color, broil for 2–3 minutes at the end.
Watch closely to avoid burning.
Rest and garnish: Let the chicken rest 5 minutes. Spoon some sauce from the pan over the top. Sprinkle with fresh parsley or dill, and serve with lemon wedges.